Irreversible reaction

Bromination of white phosphorus in a PBr3 heel

P4+6Br24PBr3

Direction
Irreversible
Processes
1
Stated as
Rate law
Heat of reaction
ΔH = -740,480 kJ/kmol (one process)
Element balance
Checked: balances
As the processes state itStoichiometry, conversions, heats of reaction and catalyst windows are taken from each process's files with their provenance. The build checks only that each process's equation balances in every element, from the process's own component formulas; it does not check the numbers. A process's design maturity applies to them.

Species

SpeciesNameCASRoleCoefficient
P4White phosphorus12185-10-3reactant-1
Br2Bromine7726-95-6reactant-6
PBr3Phosphorus tribromide7789-60-8product4

In the processes

  • Phosphorus tribromide by semi-batch bromination of white phosphorus in a PBr3 heel (1000 t/a)Concept · not reviewed

    BROM · Bromination of white phosphorus in a PBr3 heelP4 + 6 Br2 → 4 PBr3

    Stated as
    Rate law
    Phase
    liquid
    Element balance
    Balances in every element
    Heat of reaction
    ΔH = -740,480 kJ/kmol at 298.15 K, as written (given: 4 x (-184.5) - 4 x 0.62 kJ/mol: the CRC liquid formation enthalpy of PBr3 and NIST/JANAF molten white phosphorus (chemicals package), liquid bromine 0 (D-005); gas data with thermo's heat of vaporisation give -187.6 (CRC gas) to -194.2 (JANAF gas) kJ/mol PBr3 liquid, 1.7-5.3 % more)
    Rate law
    basis: volume; driving: concentration; form: power_law; k: {"A":"1.769e5","Ea":40000}; orders: {"BR2":1,"P4":1}; temperature range: 373.15 – 423.15 (assumed: ASSUMED fast effective rate (D-005): no open kinetics found (2026-11-05); to be replaced by reaction calorimetry)

Sources

What the processes cite for this reaction, each source once: for the reaction itself, its conversion, its heat of reaction or its catalyst. As the processes write them; DOIs, US patent numbers and web addresses are linked.

  1. DE 1 281 414 B / US 3 409 401 A (Chemische Fabrik Kalk, 1966/1968): bromination of phosphorus in a PBr3 heel at 120-130 C, 0.05-0.5 % bromine excess

    For the reaction · cited by Phosphorus tribromide by semi-batch bromination of white phosphorus in a PBr3 heel (1000 t/a)

  2. 4 x (-184.5) - 4 x 0.62 kJ/mol: the CRC liquid formation enthalpy of PBr3 and NIST/JANAF molten white phosphorus (chemicals package), liquid bromine 0 (D-005); gas data with thermo's heat of vaporisation give -187.6 (CRC gas) to -194.2 (JANAF gas) kJ/mol PBr3 liquid, 1.7-5.3 % more

    For the heat of reaction · cited by Phosphorus tribromide by semi-batch bromination of white phosphorus in a PBr3 heel (1000 t/a)